... lenses with 64mm diameter, for 5W/10W/15/W20W COB Led Lens material high borosilicate Refactive index 1.474 Light transmittance ... set ( lens + silicon gasket + metal holder) Suitable COB Led 10W,15W,20W,30W COB Led ( < 20 x 20 mm) IES File Available IP ... for integrated 10W -30W COB Led street lighting, road,Sideway, square, school ,courtyard,highway and other outdoor lighting places Reeth glass lens ...